thumb|upright=1.2|Binchois (right) holding a small harp and Guillaume Du Fay (left) beside a portative organ in a Illuminated manuscript copy of Martin le Franc's Le champion des dames Gilles de Bin
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bd4aea5e6c0151a7d40320520d83056fd3515b67273f397bcc583f8b4aa1224. Chain 2 (Bitcoin): anchored in block 953645 (2026-06-14T14:31:42Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3e61845d-9aee-4467-b103-a4bff9705557.json and https://artists.proofprofile.net/proofs/artist/3e61845d-9aee-4467-b103-a4bff9705557.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Binchois: Triste plaisir et douleureuse joie
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a7bceb0c3efdecd7897e32a6a4f997293bb8b4dabf4d3eff9227e8ebabf268c. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC9705272.
Binchois: Amours mercy de trespout non pooir
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfa14bc56077aa4be77c796a91d5786f18b1122081cd97f4a3240263ccb5f736. Chain 2 (Bitcoin): anchored in block 958788 (2026-07-19T22:07:06Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC9705273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a31a99d4c7b21c05ee8e643d3d1d9f2d8c9817e7c27f04391892e4988f9713b. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC9705274.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9107ad6539f89abf561457b959861bb48939657ee490a39acab5ebf62fe584ac. Chain 2 (Bitcoin): anchored in block 958529 (2026-07-18T09:21:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC9705279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x876f1f8528dc74e1fd4d728dacccb34a912cf72f7241edf4e13345db3446763d. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES7890700302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd027841074d0935a6055f5e9988caa3b972941192d203c81fce444f9dec3d43b. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES7890700307.
Gilles Binchois: Works, Vol. 2 (Arr. for Guitar)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e9eed7dca17ba6b9e1a1baa1bc5cb5a3802a3668bedac5f571017e6175a6e34. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USNO11800428.
Binchois: Musique Religieuse (For Guitar)
Le parfaict danser. Dance Music 1300-1500
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5592fa8fecb11d0748e04181696b0aea2e5c6caff7244e5a6ff2173ac01b2bb5. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/BER182245214.
Mesdisans m'ont cuide (15th Century Harp & Lute)
Dictionary of Medieval & Renaissance Instruments
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x681e523a950ffd3eda6a0d63405b9bd1942d879f422def71474c354845da881a. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/MX2831000705.
Triste plaisir (Renaissance Recorder & Viols)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcaf1ff424ce67e9161f062924f761ceeb901a6e6ec09cff051bd10aa7905dd8d. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/MX2831000719.
Je ne fais tousjours (15th Century Positive Organ)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6897534a3cd28012a018973c8169e9087b9da924f1b90489feee333d1187e0f0. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/MX2831000731.
In Spiritum: Music for Cello and Bandoneon
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad8bed16418c6031db1f6178c400f24ca23578c493e06b321a5c3d462deb5ed8. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLY332100319.
Vous ou la mort (Flemish Courtly Love Songs)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5a2d9f597485e1027b534cfb66c3adf9c39c1a352f88c4c33605c7558cc178c. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/MX2831000129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36e17e98c56c6cf5b236bec957c56f74d4db1c43c461ae2e23a41b94ec4e1b6e. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/MX2831000130.
The Florentine Renaissance: Florence’s Golden Age Under the Medici
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf92699326e56cda33935a8807cac22876bc9b5671e1288a487577af27cec7cab. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAJY2134905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c3c2b91c432f902b17c90ac32d9ada01762abc60081021a4066d24eca7cb61e. Chain 2 (Bitcoin): anchored in block 960113 (2026-07-29T13:38:16Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/UST8K1534774.
Seasons of Angels: Harmony of the Spheres
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x319f751bbf2e54fa82d009c85135ba8177e6367b57d3d34a2774364a7a8e6a33. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USTC10780576.